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Intangible Assets - Estimated Future Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Estimated future amortization expense [Abstract]    
2020 (excluding the six months ended June 30, 2020) $ 544  
2020 1,023  
2021 921  
2022 921  
2023 921  
Thereafter 894  
Net book value $ 5,224 $ 5,639